Youve played the hand well so far. It definitely looks like your trailing, but I wouldnt even worry about whether you are against a higher set or not, for now just assume you are against an overpair and a flush. What to do on the river depends on who the turn aggressor is. For instance, if you call the 3 bet and the UTG+2 caps which most likely means(AsKs,AsQs,AsJs) then you should checkraise the river if you boat up. But if the UTG+2 just calls the 3 bet, then you should bet out the river if you boat up to trap the UTG+2 player for an extra bet, and your intention is to 3 bet if raised. If youre capped and you lose to a higher set dont worry about it. Also if you dont improve on the river, you still have to make that crying call with your set, no fancy laydowns in this big pot.